Can oligarchy be like dictatorship

It is very similar, but while an oligarchy is a group of people -usually close friends or relatives- who had seized power, a Dictatorship is a rule of one person. both can be characterized by a very narrow opportunity for the citizens to have a say in the government -i. e. no parliament, or if there is a parliament there are no free elections. The citizens are to obey the orders of the power and not to question anything.